四则运算升级1 







 1 package NM;
 2 import java.util.*;
 3 public class First {
 4       public static void main (String[] agrs){
 5           double a,b,c,d;
 6           int count1=0,count2=0;
 7           int i;
 8           String[] s={"+","-","*","/"};
 9           Random r=new Random();
10           Scanner sc=new Scanner(System.in);
11               int op= 0;             
12               while(true){
13                System.out.println("选择功能：\n0.退出1.简单的加减乘除运算 2.复合运算 3.含真分数运算");
14                op= sc.nextInt();
15                if (0 == op) {break;}
16                if (1 == op) {
17                    System.out.println("(5分/道)请输入题目数目：");      
18                    int n=sc.nextInt();
19                    System.out.println("请输入算数的最大值：");
20                    int m=sc.nextInt();
21                       for(i=0;i<n;i++){
22                           a=(int) (Math.random()*(m+1)); 
23                           b=(int) (Math.random()*(m+1));
24                          int l= r.nextInt(s.length);//随机数，小于数组的长度数, 0~3  
25                          System.out.print(a+s[l]+b); //打印随机字符  
26                          System.out.print("=");
27                             double A=sc.nextDouble();
28                             if("+"==s[l]){
29                                 if(A==a+b){
30                                     System.out.println("this is right!");
31                                     count1++;
32                                 }
33                                 else {
34                                    System.out.println("this is wroing!"+"正确答案是:"+(a+b));
35                                    count2++;
36                                    }
37                          }
38                          else if("-"==s[l]){
39                              if((a-b)>-11){
40                                     if(A==a-b){
41                                         System.out.println("this is right!");
42                                         count1++;
43                                     }
44                                     else {
45                                        System.out.println("this is wroing!"+"正确答案是:"+(a-b));
46                                        count2++;
47                                        }
48                              }
49                              else{
50                                   a=(int) (Math.random()*(m+1)); 
51                                   b=(int) (Math.random()*(m+1))+1;
52                              }
53                             }
54                          else if("*"==s[l]){
55                              if(A==a*b){
56                                     System.out.println("this is right!");
57                                     count1++;
58                                 }
59                              else {
60                                     System.out.println("this is wroing!"+"正确答案是:"+(a*b));
61                                     count2++;
62                                 }
63                          }
64                          else if("/"==s[l]){
65                              if(A==a/b){
66                                     System.out.println("this is right!");
67                                     count1++;
68                                 }
69                              else {
70                                   System.out.println("this is wroing!"+"正确答案是:"+String.format("%.2f",a/b));
71                                   count2++;
72                                 }
73                          }      
74                       }
75                       System.out.println("此题对了:"+count1+" "+"错了:"+count2+" "+"得分为:"+5*count1);
76                } 
77                else if (2 == op) {
78  
79                    
80                    
81                    
82                    
83                    
84                }
85                else if (3 == op) {
86                
87                } 
88                else{
89                    System.out.println("输入有误，请重新输入；");
90                }
91               }
92               
93       }
94 }



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使用的是工具是：eclipse

补上昨天的成果，用零碎的时间来写代码的，所以具体完成的时间不是很清楚，做的也很仓促，没有过多的考虑代码的整合。第二第三个功能，想的比较混乱，还没有做出来，随后回补上的。坚持，争取有进步~~~




 






 


 




 






            

            
posted @ 
2015-03-30 13:19 
思亭 
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